Mask classification and use

Ordinary masks or gauze masks: it can only filter larger particles, and is only used for low-level cleaning work.

Outer mouth mask: It can block more than 90% of 5 particles, and should be replaced every day, but it should be replaced immediately if it is damaged or dirty.

Wait for the respiratory tract n case of symptoms, use when going to a non-ventilated place such as a hospital movie theater

Activated carbon mask: It can absorb organic gas and toxic sealing powder, and has no sterilization function. If you need to breathe hard or cannot absorb odor, you should replace it immediately.